Studies on the growth characters and nutrient uptake related to source and sink by cool water temperature at reproductive growth stage, 2; influence of cool water irrigation on the inorganic element content of leaf blades, rachis branches and chaff of rice
1986
Choi, S.I. | Whang, C.J. (Chonbuk Provincial Rural Development Administration, Iri (Korea R.)) | Lee, J.H. (Wonkwang Univ., Iri (Korea R.))
This study was investigated about influence of different cold water irrigation on the nutrient uptake of leaf blade, rachis branches and chaff. Longer duration of cold water irrigation increased total nitrogen content in leaf blade, branches and chaff but decreased the content of phosphate, potassium and silicate. The highest content of total nitrogen and phosphate showed at heading stage, that of potassium in leaf blades and branches at heading but in chaff at maturing stage, and that of silicate at maturing stage. Inorganic element content in branches was similar with that in chaff in general. The excessive uptake of nitrogen by cold water irrigation caused decrease in the uptake phosphate, potassium and silicate showing clear nutrient disorder in the blades and chaff. High total nitrogen and low silicate in rice plants seemed to lead to degeneration of branches and spikelets, and to spikelet sterility. Degeneration and sterility appeared to be closely related to nutrient status of branches
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